System of ventilation for transformers



C. G. JONES.

SYSTEM 0F VENTILATION FOR TRANSFOBMERS. APPLICATION FILED AuG.3, IQII.

1,351,042. v PawnwdAug. 31,1920.

WITNESSES: l INVENTOR UNITED VSTATES PATENT OFFICE.

CARL G. JONES, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMIPAN-Y, A CORPORATION OF PENNSYLVANIA.

SYSTEM OE VENTILATION FOR TRANSFORMERS.

Specification of Letters Patent.

I Application led August 3, 1917. Serial No. 184,237.

To all whom t may concern:

Be it known that I, CARL Gr. JONES, a citizen of the United States, and a resident of -used as' an insulating and cooling agent',

and it has for its object to provide a system of the character designated whereby the air in the transformer casing shall be kept substantially free from explosive gases without injuring the insulating qualities of the oil and with the use of simple and inexpensive auxiliary apparatus.

The single figure of the accompanying drawing is a side view, partially in section and partially in elevation, of a transformer embodying my invention.

It is usual, in constructing oil-insulated transformers, to make the casings as nearly air tight as possible to prevent the absorption of atmospheric moisture by the oil, with consequent impairment of the insulating properties of the oil. Also, in an oil-insulated or oil-cooled transformer, there is always some oil vapor mixed with the air in the casing. Such mixture may be explosive and, therefore, objectionable. By my inn vention, I provide a simple and inexpensive auxiliary apparatus whereby the air and gas mixture in a transformer casing may be continuously replaced by fresh dry air.

Referring to the single figure of the accompanying drawing, a transformer casing l contains a gas-evolving insulating and cooling fluid 2, which may be oil or some other suitable substitute, an air chamber 3, which is inclosed bythe cover 4, and a cooling coil 5, having inlet and outlet. tubes protruding through the transformer casing so that cooling fluid may be circulated therethrough. The transformer casing l is further provided with an air-inlet member 6 to which is attached a device" 7 wherein the air is dried before entering the air chamber 3. The air passes through the air chamber 3 above the surface of the liquid 2, as indicated by the arrows 8, to an air-outlet device 9 comprising an aspirator which is operated by y thecirculating fluid in the cooling coil The fluid in the cooling coil 5 passes out through the outlet 10, taking with it the mixture of air and gas. This provides a continuous current of air through the air chamber 3 and thereby insures the removal of the explosive gases.

lVhile I have shown my invention in its preferred form, it will be obvious to those skilled in the art that it is susceptible of various minor changes and alterations without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or are specifically set forth in the appended claims.

I claim as my invention:

l. Thev combination with a closed container partially filled with a gas-evolving liquid, of a coil for circulating cooling fluid within said container, means for utilizing said cooling fluid to eject the airand-gas mixture that forms above said liquid and for introducing air into the space above said liquid. v

2.. The combination with a transformer casing partially filled with oil, of a coil for circulating cooling fluid within said casing. means for utilizing said cooling fluid to cj ect ythe air-and-gas mixture that,V forms above said oil, and .means for drying air and admitting it above said oil.

3. The combination with a closed container partiallyflilled with a gas-evolving liquid, of a coil for circulating cooling fluid within `said container, an aspirating device for utilizing the cooling fiuid to eject the air-and-gas mixture that forms above said liquid, and means for permitting the introduction of air above said liquid.

4. The combination with a transformer casing partially filled with insulating' fluift of a cooling coil therein, means associated with said cooling coil for continuously withdrawing the air from the interior of said casing, and means for introducing dry air to take the place of the withdrawn air.

5. rI`he combination with a transformer casing .partially filled with insulating fluid, of a cooling coil therein, an outlet for the air above said fluid, said outlet opening into the outlet of said cooling coil whereby the air iscontinuously drawn from said casing, and means for introducing dryair to take the place of the withdrawn air.

In testimony whereof, I have hereunto subscribed iny naine this 17th day of July, 191?.

f CARL G. JGNIS.

Patented Aug. 31, 1920. 

